This article is for Cable Matters model numbers 201018 / 201028 / 201031 / 201062 / 201038 to solve the refresh rate issue in macOS after updating to 10.14 Mojave. In the new macOS, the refresh rate list box has been removed for HDMI adapters.

Mojave Previous macOS

Since macOS defaults to 30Hz and now does not allow users to manually change to 60Hz, it is inconvenient for users who need 60Hz while using Cable Matters USB-C adapters and cables. We found a safe and convenient utility tool called Retina Display Menu (RDM) which can adjust the refresh rate with just a couple of clicks. Please follow the steps below to download and install the utility.